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Describe the breathing mechanism?
- Inspiration, Expiration
- Inspiration:
- 1. Brain detects a rise in CO2 levels (occurs every 4-5 sec at rest) and sends a message via nerves to the intercoastal muscles and diaphragm to contract.
- 2. As a result the ribs and sternum move up and outwards, the diaphragm flattens.
- 3. The volume of the thoracic cavity increases.
- 4. As the volume increases the pressure inside the lungs decrease.
- 5. Hence, air rushes into the lungs to equalise the pressure (of atmosphere and chest).
- Expiration:
- 1. Intercoastal muscles and diaphragm relax - ribs and sternum move down and in, diaphragm becomes dome-shaped.
- 2. Volume of thoracic cavity decreases.
- 3. As a result air pressure on lung walls increases.
- 4. Therefore air is forced out of the lungs.
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Describe the process of inspiration?
- Inspiration:
- 1. Brain detects a ruse in CO2 levels (occurs every 4-5 sec at rest) and sends a message via nerves to the intercoastal muscles and diaphragm to contract.
- 2. As a result the ribs and sternum move up and outwards, the diaphragm flattens.
- 3. The volume of the thoracic cavity increases.
- 4. As the volume increases the pressure inside the lungs decrease.
- 5. Hence, air rushes into the lungs to equalise the pressure (of atmosphere and chest).
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What is the first step in inspiration?
1. The brain detects a Rudd in CO2 levels (occurs every 4-5 sec at rest) and sends a message via nerves to the intercoastal muscles and diaphragm to contract.
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What detects a rise in CO2 levels, initiating the inspiration?
The brain detects a rise in CO2 levels (occurs every 4-5 sec at rest) and sends a messages via nerves to the intercoastal muscles and diaphragm to contract.
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How often dues a rise in CO2 levels occur?
A rise in CO2 levels occurs every 4-5 sec at rest.
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How is message sent from the brain to intercoastal muscles and diaphragm?
The brain sends a message via nerves to the intercoastal muscles and diaphragm to contract.
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What causes the intercoastal muscles and diaphragm to contract?
The brain detects a rise in CO2 levels (occurs every 4-5 sec at rest) and sends a message via nerves to the intercoastal muscles and diaphragm to contract.
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What action results in the ribs and sternum to move up and out (during inspiration)?
The intercoastal muscles and diaphragm contract resulting in the ribs and sternum to move up and outwards and the diaphragm flattens.
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What action results in the diaphragm to flatten during inspiration?
The intercoastal muscles and diaphragm contract resulting in the ribs and sternum to move up and outwards and the diaphragm flattens.
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What happens the thoracic cavity volume in inspiration?
At inspiration the volume of the thoracic cavity increases
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What happens as the volume of the thoracic cavity increases in inspiration?
As the volume of the thoracic cavity increases, the pressure inside the lungs decrease.
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Does the pressure inside the lungs increase/decrease during inspiration?
The pressure inside the lungs decrease in inspiration.
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How does air rush into the lungs during inspiration?
- As the volume increases the pressure inside the lungs decrease.
- Hence air rushes into the lungs to equalise the pressure (of atmosphere and chest).
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